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Pension and Other Postretirement Benefits
 9 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
The components of the net periodic pension expense (income) related to the Company's pension and other postretirement benefits for the three and nine months ended March 31, 2025 and 2024 were as follows:
Three Months Ended March 31,
2025202420252024
($ in millions)Pension PlansOther Postretirement Plans
Service cost$1.9 $2.1 $0.4 $0.3 
Interest cost9.7 10.4 2.5 2.6 
Expected return on plan assets(7.5)(8.3)(2.1)(1.8)
Amortization of net loss (gain)1.9 1.9 (1.4)(0.6)
Amortization of prior service cost (credits)0.5 0.5 0.3 (1.0)
Pension settlement charge— 51.9 — — 
    Net pension expense (income)$6.5 $58.5 $(0.3)$(0.5)
Nine Months Ended March 31,
2025202420252024
($ in millions)Pension PlansOther Postretirement Plans
Service cost$6.0 $6.2 $1.0 $1.1 
Interest cost29.0 34.0 7.5 7.6 
Expected return on plan assets(22.5)(28.5)(6.3)(5.5)
Amortization of net loss (gain)5.7 6.2 (4.2)(1.9)
Amortization of prior service cost (credits)1.5 1.6 0.9 (2.9)
Pension settlement charge— 51.9— — 
    Net pension expense (income)$19.7 $71.4 $(1.1)$(1.6)

During the nine months ended March 31, 2025 and 2024, the Company made $58.5 million and $4.9 million, respectively, of cash contributions to its qualified defined benefit pension plans. The Company currently expects to make $6.0 million of required cash pension contributions to its qualified defined benefit pension plans during the remainder of fiscal year 2025.